[hamiam]

Im not a mechanic but ive been told on several occasions that nothing is worse for a diesel than to run her with no or little load. most mechanics ive spoken to throw out an ideale rpm range of approx 75%-85% of max rpms. As for the white smoke, I had a episode of that myself. Much unlike Garygroves, I was told (and it made sense) that the white smoke was from the engine running too lean (ie too little fuel for the amount of air). As my fuel filter was clogged this would make sense. I would imagine that blue or black smoke is probably the result of unburnt fuel, no? If it was steam, that opens up paradora''s box of problems including a warped head, etc.